genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 15675 Comm: syz.5.6550 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ce490>] lr : [<813ce480>] psr: 60000013 sp : dfa0dd30 ip : dfa0dd30 fp : dfa0dd54 r10: 82b25910 r9 : 00000003 r8 : 842930c0 r7 : dfa0dd90 r6 : 842930c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1771c r1 : 00000001 r0 : 813ce100 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87531300 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 842930c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 842930c0 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa0c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.5.6550 (pid: 15675, stack limit = 0xdfa0c000) Stack: (0xdfa0dd30 to 0xdfa0e000) dd20: 823f12b4 842930c0 829d1bf4 829d1bf4 dd40: 81e17bdc 84293104 dfa0dd8c dfa0dd58 813ca520 813ce328 200000c0 00000000 dd60: dfa0dd7c 200000c0 842930c0 b5403587 200000c0 8583d400 40946400 00000003 dd80: dfa0de4c dfa0dd90 813c606c 813ca424 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 dde0: 10000105 00000000 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 fffffffd effffff8 de20: 00000000 73ae798f 00000000 892cd540 842930c0 200000c0 200000c0 8583d400 de40: dfa0df14 dfa0de50 813c7038 813c5f78 00000000 00000000 00000000 73ae798f de60: 00000000 00000000 824625b4 0000005f 83d51018 842930f0 84103d44 8583d400 de80: dfa0dee4 dfa0de90 807a7484 8079d87c 00000064 00000001 00000000 dfa0deac dea0: 85ce90d0 834e07f8 00006400 0000000b dfa0dea0 00000000 00000000 73ae798f dec0: 892cd540 40946400 200000c0 200000c0 892cd540 00000003 dfa0def4 dfa0dee8 dee0: 807a75a4 73ae798f dfa0df14 40946400 00000000 892cd541 200000c0 892cd540 df00: 00000003 8583d400 dfa0dfa4 dfa0df18 80578730 813c6a68 ecac8b10 8583d400 df20: dfa0df3c dfa0df30 81a606f8 81a605c8 dfa0df54 dfa0df40 8025c484 8028d914 df40: dfa0dfb0 40000000 dfa0df84 dfa0df58 802229ec 8025c440 00000000 8281cfb4 df60: dfa0dfb0 0014ca70 ecac8b10 80222940 00000000 73ae798f dfa0dfac 00000000 df80: 00000000 00316448 00000036 8020029c 8583d400 00000036 00000000 dfa0dfa8 dfa0: 80200060 8057860c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76fb30bc dfe0: 76fb2ec0 76fb2eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce31c>] (parport_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84293104 r5:81e17bdc r4:829d1bf4 [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8583d400 r7:200000c0 r6:b5403587 r5:842930c0 r4:200000c0 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8583d400 r7:200000c0 r6:200000c0 r5:842930c0 r4:892cd540 [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8583d400 r9:00000003 r8:892cd540 r7:200000c0 r6:892cd541 r5:00000000 r4:40946400 [<80578600>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa0dfa8 to 0xdfa0dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76fb30bc dfe0: 76fb2ec0 76fb2eb0 000195a4 00132510 r10:00000036 r9:8583d400 r8:8020029c r7:00000036 r6:00316448 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction